Optimal placement of semi-active joints in large-space truss structures

Jan Wirnitzer; A. Kistner; Lothar Gaul

doi:10.1117/12.472660

27 June 2002 Optimal placement of semi-active joints in large-space truss structures

Jan Wirnitzer, A. Kistner, Lothar Gaul

Proceedings Volume 4697, Smart Structures and Materials 2002: Damping and Isolation; (2002) https://doi.org/10.1117/12.472660
Event: SPIE's 9th Annual International Symposium on Smart Structures and Materials, 2002, San Diego, California, United States

Abstract

The low structural damping of large space structures and the stringent positioning requirements in missions demand effective vibration suppression. The semi-active approach at hand is based on friction damping due to interfacial slip in semi-active joints which can be controlled by varying the normal pressure in the contact area using a piezo-disc actuator. This paper focuses on the optimal placement of semi-active joints for vibration suppression. The proposed method uses optimality criteria for actuator and sensor locations based on eigenvalues of the controllability and observability gramians. It is stated as a nonlinear multicriteria optimization problem with discrete variables which is solved by a stochastic search algorithm. As final step in the design procedure, parameters of the local feedback controllers assigned to each adaptive joint are optimized with respect to transient response of the structure. The present method is applied to a 10-bay truss structure. Simulation runs of the controlled structure are used to verify the optimization results.

Citation Download Citation

Jan Wirnitzer, A. Kistner, and Lothar Gaul "Optimal placement of semi-active joints in large-space truss structures", Proc. SPIE 4697, Smart Structures and Materials 2002: Damping and Isolation, (27 June 2002); https://doi.org/10.1117/12.472660

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